Balancing Scattering Channels: A Panoscopic Approach toward Zero Temperature Coefficient of Resistance Using High-Entropy Alloys
Artikel i vetenskaplig tidskrift, 2019

Designing alloys with an accurate temperature-independent electrical response over a wide temperature range, specifically a low temperature coefficient of resistance (TCR), remains a big challenge from a material design point of view. More than a century after their discovery, Constantan (Cu–Ni) and Manganin (Cu–Mn–Ni) alloys remain the top choice for strain gauge applications and high-quality resistors up to 473–573 K. Here, an average TCR is demonstrated that is up to ≈800 times smaller in the temperature range 5–300 K and >800 times smaller than for any of these standard materials over a wide temperature range (5 K < T < 1200 K). This is achieved for selected compositions of AlxCoCrFeNi high-entropy alloys (HEAs), for which a strong correlation of the ultralow TCR is established with the underlying microstructure and its local composition. The exceptionally low electron–phonon coupling expected in these HEAs is crucial for developing novel devices, e.g., hot-electron detectors, high-Q resonant antennas, and materials in gravitational wave detectors.

temperature coefficient of resistance

electrical resistivity

high-entropy alloys

Kondo scattering

microstructure

Författare

Samrand Shafeie

Chalmers, Fysik, Material- och ytteori

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Paul Erhart

Chalmers, Fysik, Material- och ytteori

Q. Hu

Jiangxi Academy of Sciences

Anders Palmqvist

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Advanced Materials

09359648 (ISSN) 15214095 (eISSN)

Vol. 31 2 1805392

Ämneskategorier

Keramteknik

Annan materialteknik

Den kondenserade materiens fysik

DOI

10.1002/adma.201805392

PubMed

30407664

Mer information

Senast uppdaterat

2019-07-17